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Vermiculite Compressive Strength - Forno Bravo Forum: The Wood-Fired Oven Community


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Vermiculite Compressive Strength

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  • Vermiculite Compressive Strength

    Does anyone know if the hearth four inch vermiculite-cement insulation layer is stable enough to support a six foot brick flue? Vermiculite seems to be too soft and is causing concern. If any of you have or know of any ovens with longer flues, please advise.

  • #2
    Re: Vermiculite Compressive Strength

    Yes it is stable. My oven has over 7 inches of thermal mass for the floor and dome. So it's almost twice in weight of a standard oven and my vermiculite has not settled at all. You are good to go.

    I though the same thing when I built mine. I made a test piece and was truly surprised how strong it is.


    • #3
      Re: Vermiculite Compressive Strength

      How about a half ton oven sat on 1" of vermiculite?


      • #4
        Re: Vermiculite Compressive Strength

        Originally posted by sonomacast View Post
        How about a half ton oven sat on 1" of vermiculite?
        You may need to put some sort of support ring around the outside of the vermcrete to contain and protect the outer edge.



        • #5
          Re: Vermiculite Compressive Strength

          I built my oven on a 4.5 inch layer of 5:1 vermicrete. As I was mortaring the oven, I used the excess mortar on the outer edges. I finally mixed a big batch and finished covering the ends of the vermicrete layer, worked fine.


          • #6
            Re: Vermiculite Compressive Strength

            Thanks for the comments. I feel better about the vermicrete supporting the heavier than usual flue.